Rolfe Winkler and Andy Pasztori got access to some internal SpaceX documents detailing future plans. I don't know about you, but this was news to me:

SpaceX projected the satellite-internet business would have over 40 million subscribers and bring in more than $30 billion in revenue by 2025, according to the documents. The internet service is currently in planning stages without a factory or a full-fledged team of engineers, according to industry officials and earlier comments by company President Gwynne Shotwell.

And:

SpaceX plans to eventually launch its own constellation of over 4,000 communications satellites—about 70 times the size of any current communications array—to provide global internet access, forecasting the first phase to go online by 2018, according to the documents.

And:

The company expects revenue from the satellite business to overtake SpaceX’s core launch division by 2020, and by 2025 to generate an operating profit of between $15 billion and $20 billion, according to the documents.

A global internet business in order to finance missions to Mars. Now that's a big idea.